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Solvent Extraction Recovery of Nickel from Spent Electroless Nickel Plating Baths Using a Mixer-Settler Extractor

机译：使用混合沉降式萃取器从废化学镀镍液中萃取镍

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Although electroless nickel plating is now an indispensable surface finishing technology, the treatment of the spent baths is a serious problem. We proposed a recovery process of nickel in the spent baths, in which nickel is recovered as nickel sulfate via solvent extraction with LIX84I, one of the typical chelating reagents, and then reused in the plating process. Our previous batch shaking-out test revealed that the extraction and stripping of nickel with LIX84I were not fast, while the addition of a small amount of the acidic organophosphorous reagent such as D2EHPA and PC88A enhances these rates. In the present study, the continuous experiment using a small mixer-settler extractor was undertaken with the mixture of 20 vol%LIX84I, 2 vol%PC88A, and Shellsol D70 as the organic phase. The effects of the flow rates and the number of stages were assessed. It was found that high efficiencies were achieved both in the extraction and stripping under the appropriate conditions.
机译：尽管化学镀镍现在是必不可少的表面处理技术，但对废液的处理却是一个严重的问题。我们提出了一种在废液中回收镍的方法，其中通过用典型螯合剂之一的LIX84I进行溶剂萃取，以硫酸镍的形式回收镍，然后将其再用于电镀过程中。我们以前的分批振动试验表明，用LIX84I萃取和汽提镍的速度并不快，而添加少量的酸性有机磷试剂（如D2EHPA和PC88A）则可以提高这些速率。在本研究中，使用小型混合沉降式萃取器进行的连续实验以20％（体积）LIX84I，2％（体积）PC88A和Shellsol D70的混合物作为有机相。评估了流速和级数的影响。发现在合适的条件下在提取和汽提中都实现了高效率。

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